New Antisolvent Precipitation Synthesis of Green-Emitting Lead-Free Zinc-Alloyed Perovskite-Inspired Manganese Halides Cs₃Mn_1–xZn_xBr₅

Abstract

Along with its instability, a major drawback of the well-known CsPbX 3 perovskite is lead toxicity, which motivates the development of new halides that are interesting for their optical properties. In this paper, a new antisolvent precipitation method is proposed to achieve Cs 3 MnBr 5 with a relatively narrow 520 nm green emission under UV and blue excitations. Results show that phase stability in air is improved through zinc alloying, which leads to a decrease in its hydration propensity. Zinc alloying results in larger particles and a significant enhancement of the internal quantum yield, from 20% for Cs 3 MnBr 5 to 65% for Cs 3 Zn 0.6 Mn 0.4 Br 5 under blue excitation. In brief, this work opens a new perspective to easily produce lead-free perovskite-inspired manganese halides, whose optical properties are suitable for association with commercial blue or UV LEDs.